rm-hull / jasengo / 19392825403

Pull #3

github

refactor: Abstract binary expression parsing logic

Introduces `buildExprParser` to DRY up the construction of
precedence chains (like `AND` and `OR` expressions) in the
example parser test file.

This change also:
*   Includes `parser.Upper()` in the definition of
    `alphaNum` tokens, allowing uppercase words in expressions.
*   Fixes a typo in the description of `Upper()`:
    "upperrcase letter" -> "uppercase letter".

35 of 40 new or added lines in 2 files covered. (87.5%)

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